diff options
| author | Jason Davis <jason@rightthere.net> | 2005-04-16 15:24:53 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:24:53 -0700 |
| commit | 90660ec3c3e3f463a3cc7005213345b6c9ecfab9 (patch) | |
| tree | 1b9d29d6db925d41e282f2f3dcff189b4c185f90 /arch/x86_64/kernel/genapic.c | |
| parent | 107ce721abddbd876aa6203ac982821e405400e9 (diff) | |
[PATCH] x86_64 genapic update
x86_64 genapic mechanism should be aware of machines that use physical APIC
mode regardless of how many clusters/processors are detected.
ACPI 3.0 FADT makes this determination very simple by providing a feature
flag "force_apic_physical_destination_mode" to state whether the machine
unconditionally uses physical APIC mode.
Unisys' next generation x86_64 ES7000 will need to utilize this FADT
feature flag in order to boot the x86_64 kernel in the correct APIC mode.
This patch has been tested on both x86_64 commodity and ES7000 boxes.
Signed-off-by: Jason Davis <jason.davis@unisys.com>
Acked-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64/kernel/genapic.c')
| -rw-r--r-- | arch/x86_64/kernel/genapic.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/genapic.c b/arch/x86_64/kernel/genapic.c index d2c42fb99cb..69b9c25a8fc 100644 --- a/arch/x86_64/kernel/genapic.c +++ b/arch/x86_64/kernel/genapic.c @@ -20,6 +20,10 @@ #include <asm/smp.h> #include <asm/ipi.h> +#if defined(CONFIG_ACPI_BUS) +#include <acpi/acpi_bus.h> +#endif + /* which logical CPU number maps to which CPU (physical APIC ID) */ u8 x86_cpu_to_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID }; EXPORT_SYMBOL(x86_cpu_to_apicid); @@ -47,6 +51,18 @@ void __init clustered_apic_check(void) goto print; } +#if defined(CONFIG_ACPI_BUS) + /* + * Some x86_64 machines use physical APIC mode regardless of how many + * procs/clusters are present (x86_64 ES7000 is an example). + */ + if (acpi_fadt.revision > FADT2_REVISION_ID) + if (acpi_fadt.force_apic_physical_destination_mode) { + genapic = &apic_cluster; + goto print; + } +#endif + memset(cluster_cnt, 0, sizeof(cluster_cnt)); for (i = 0; i < NR_CPUS; i++) { |